fix: remove unnecessary structure and update label attributes

[BQXBQX]

Checklist

• npm test passes

• commit message follows commit guidelines
• documents are updated

Description of change

• Removed redundant structure in the label rendering process.
• Replaced elementStyle with element to expose the correct attributes in label functions.

[coveralls]

Pull Request Test Coverage Report for Build 12192827959

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.66%

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Totals
Change from base Build 12182291538:	0.0%
Covered Lines:	10611
Relevant Lines:	11866

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💛 - Coveralls

[hustcc]

这个 PR 关闭哈，还是先保持传入 elementStyle 就好。我先想想！还有点纠结~

[hustcc]

延续 #6536 PR，修改更合适的接口粒度。